Cloudflare is the largest free DNS hosting providers in the world and they also are technically a managed DNS host. They do provide you with additional security features such as rate limiting, filtering, and blocking. Cloudflare’s speeds are also faster than most premium DNS providers.
Namecheap is known for their domain name registration services, but they also offer free DNS hosting featuring DynamicDNS. Namecheap’s FreeDNS hosting service can work great as a backup to your primary DNS Hosting service.
ClouDNS offers 4 DNS servers, 3 Zones, Dynamic DNS, round robin, native IPv6 support, and has no limits or restrictions on the records or requests. They also recently introduced premium plans with DDoS protected servers and GeoDNS.
FreeDNS offers Free DNS, Dynamic DNS hosting, static DNS hosting. They have been in operation since 2004 and have a long history of providing solid free DNS hosting. FreeDNS is now routinely processing over 7 billion DNS requests per month.
Hurricane Electric (he.net) Internet Services provide a 100% free DNS hosting service with solid connectivity all over the world. He.net is made up of over 60 POPs and supports IPv6 everywhere.
Rackspace offers free DNS hosting and management for current customers. They feature automated migrations, IP Anycast routing, load balancing, and flexible access via their cloud control panel and RESTful API.
1984 is a web hosting company that also offers a FreeDNS service, available through their easy to use web interface. Apart from normal DNS records they also allow web redirects.
Linode’s DNS Manager is a comprehensive interface within the Linode Cloud Manager that gives you complete oversight of DNS records.
Hosting DNS records with the Linode DNS Manager is free. In order to use the DNS Manager to serve your domains, you must have an active Linode on your account.
DigitalOcean’s DNS tools let you manage DNS records for DigitalOcean and non-DigitalOcean resources in the same place you manage your infrastructure.
DigitalOcean currently supports A, AAAA, CAA, CNAME, MX, NS, TXT, and SRV records.
Vultr offers free DNS hosting for customers’ domains. The nameservers are on an AnyCAST network and ensure fast DNS resolution. You are not required to use Vultr DNS when using other Vultr services, but it’s fast, free, and easy to use.
The Vultr API offers several endpoints to manage DNS.